Question

What is the value of the product (3 - 2i)(3 + 2i)

Answer 1

13

Explanation:

(3 - 2i)(3 + 2i)

FOIL

first 3*3 = 9

outer 3*2i = 6i

inner -2i*3 = -6i

last -2i * 2i = -4i^2 = -4(-1) =4

Add together

9+6i-6i+4 = 13